title: Bioavailability and potential carcinogenicity of polycyclic aromatic hydrocarbons from wood combustion particulate matter in vitro.
abstract: Due to increasing energy demand and limited fossil fuels, renewable energy sources have gained in importance. Particulate matter (PM) in general, but also PM from the combustion of wood is known to exert adverse health effects in human. These are often related to specific toxic compounds adsorbed to the PM surface, such as polycyclic aromatic hydrocarbons (PAH), of which some are known human carcinogens. This study focused on the bioavailability of PAHs and on the tumor initiation potential of wood combustion PM, using the PAH CALUX® reporter gene assay and the BALB/c 3T3 cell transformation assay, respectively. For this, both cell assays were exposed to PM and their respective organic extracts from varying degrees of combustion. The PAH CALUX® experiments demonstrated a concentration-response relationship matching the PAHs detected in the samples. Contrary to expectations, PM samples from complete (CC) and incomplete combustion (IC) provided for a stronger and weaker response, respectively, suggesting that PAH were more readily bioavailable in PM from CC. These findings were corroborated via PAH spiking experiments indicating that IC PM contains organic components that strongly adsorb PAH thereby reducing their bioavailability. The results obtained with organic extracts in the cell transformation assay presented the highest potential for carcinogenicity in samples with high PAH contents, albeit PM from CC also demonstrated a carcinogenic potential. In conclusion, the in vitro assays employed emphasize that CC produces PM with low PAH content however with a general higher bioavailability and thus with a nearly similar carcinogenic potential than IC PM.
authors.affiliation: Human and Environmental Toxicology, University of Konstanz, D-78457 Konstanz, Germany. Electronic address: susanne.gauggel@uni-konstanz.de.
authors.forename: Susanne
authors.initials: S
authors.lastname: Gauggel-Lewandowski
authors.forename: Alexandra H
authors.initials: AH
authors.lastname: Heussner
authors.forename: Pablo
authors.initials: P
authors.lastname: Steinberg
authors.forename: Bart
authors.initials: B
authors.lastname: Pieterse
authors.forename: Bart
authors.initials: B
authors.lastname: van der Burg
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Dietrich
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001571:Benzoflavones / Q000737:chemistry / Q000494:pharmacology; D017930:Genes, Reporter / Q000187:drug effects; D008156:Luciferases / Q000378:metabolism; D051379:Mice; D052638:Particulate Matter / Q000032:analysis / Q000633:toxicity*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000633:toxicity*; D018336:Receptors, Aryl Hydrocarbon / Q000037:antagonists & inhibitors / Q000378:metabolism; D014934:Wood / Q000737:chemistry*
chemical_list: D001571:Benzoflavones; D052638:Particulate Matter; D011084:Polycyclic Aromatic Hydrocarbons; D018336:Receptors, Aryl Hydrocarbon; C011512:alpha-naphthoflavone; D008156:Luciferases
keywords: ANF; BALB/c 3T3 cell transformation assay; CC; IC; PAH; PAH CALUX®; PM; Particulate matter; Polycyclic aromatic hydrocarbons; Wood combustion; alpha-naphthoflavone; complete combustion; incomplete combustion; particulate matter; polycyclic aromatic hydrocarbon